<html>

<head>
    <meta charset="UTF-8">
    <title>
        post test
    </title>
</head>

<body>
    <form name="input" action="Operation.php" method="post">
        a = <input type="text" name="a" /> <br /> <br />
        b = <input type="text" name="b" /> <br /> <br />
        c = <input type="text" name="c" /> <br /> <br />
        d = <input type="text" name="d" /> <br /> <br />
        提交 : <input type="submit" value="Submit" />
        <form />
</body>

</html>  
